Hasarias

Hasarias is a fictional planet featured in the science fiction novel "Project Hail Mary" by Andy Weir. In the story, Hasarias is a star system located in the Kepler-186 system, approximately 500 light-years from Earth. The planet itself is described as having a breathable atmosphere and a surface covered in lush, alien flora.

The primary inhabitants of Hasarias are a sentient alien species known as the Eridians. Eridians are depicted as a peaceful and technologically advanced race, though their civilization has been significantly impacted by a mysterious disease that is dimming their sun. This planetary crisis is the central conflict driving the plot of "Project Hail Mary," as the protagonist, Ryland Grace, travels to Hasarias to find a solution.

Hasarias is characterized by its unique bioluminescent plant life, which plays a crucial role in the ecosystem and the Eridians' way of life. The planet's geology and atmospheric composition are also distinctive, contributing to its alien appearance and the challenges faced by both the Eridians and the human protagonist. The narrative explores the Eridians' culture, their relationship with their environment, and their desperation to save their home world. The planet serves as a vital setting for the scientific problem-solving and interspecies cooperation that are hallmarks of Weir's writing.